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A Practical Guide to Ubuntu Linux (Versions 8.10 and 8.04), Second Edition by Mark G. Sobell

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Bringing the System Down

The shutdown and reboot utilities perform the tasks needed to bring the system down safely. These utilities can restart the system, prepare the system to be turned off, and, on most hardware, power down the system. The poweroff and halt utilities are links to reboot.

You must tell shutdown when you want to bring the system down. This time can be expressed as an absolute time of day, as in 19:15, which causes the shutdown to occur at 7:15 PM. Alternatively, you can give this time as the number of minutes from the present time, as in +15, which means 15 minutes from now. To bring the system down immediately (recommended for emergency shutdowns only or when you are the only user logged in), you can give the argument ...

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